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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for December 19th, 2018

Spring4D How to correctly assign NULL to a Nullable type?

Posted by jpluimers on 2018/12/19

Since I tend to forget this: [WayBack] Spring4D How to correctly assign NULL to a Nullable type? this is correct? fDateTime = Null; or this? fDateTime := nil; – Jacek Laskowski – Google+

The preferred way is fDateTime := nil.

This is possible because of [WayBack] Delphi sorcery: How to create an operator overload that only accepts nil using a reference type (in this case interface) so no non-nil pointers can be passed:

type
  Nullable<T> = record
  strict private type
    Null = interface end;
  public
    class operator Implicit(const value: Null): Nullable<T>;
  end;

–jeroen

Posted in Delphi, Development, Software Development, Spring4D | 2 Comments »

“I tyically ask recruiters to point out which of these are pokemon” – via “my linkedin profile : ProgrammerHumor”

Posted by jpluimers on 2018/12/19

[Archive.is] Vincent D. Warmerdam (also known as koaning; D is for Damian) put Start-up or Pokémon? Big-data or Pokémon? into practice a while back:

my linkedin profile: “I tyically ask recruiters to point out which of these are pokemon”

Source: [WayBack] “my linkedin profile : ProgrammerHumor”

He’s a very interesting person to follow:

I also discovered https://bl.ocks.org because of Vincent. More on that later.

–jeroen

Read the rest of this entry »

Posted in Cloud Development, Development, Software Development | Leave a Comment »

Python threading: logging exceptions during the `run`

Posted by jpluimers on 2018/12/19

In A few observations on Python while I made my first steps into it, I mentioned the standard threading idiom in Python by wrapping the thread in a function. This has the drawback of having to catch and handle any exceptions in that function.

The higher level [WayBack] threading module has a [WayBack] Thread class with a [WayBack] run() method does not handle exceptions either.

For investigation of threading issues, it’s very convenient to know about the exceptions in a thread and their context.

So I’ve made a small base class that automagically logs any exceptions during a run:

import threading

from log import Log

class ExceptionLoggingThread(threading.Thread):

    def __init__(self):
        threading.Thread.__init__(self)
        self.logger = Log().getLogger()
        self.logger.debug("ExceptionLoggingThread().")

    def run_logic(self):
        self.logger.debug("Thread started.")

    def run(self):
        try:
            self.run_logic()
        except:
            self.logger.exception('Exception in `run`')
            raise

–jeroen

Posted in Development, Python, Scripting, Software Development | Leave a Comment »

Spring4D Conference

Posted by jpluimers on 2018/12/19

Do not forget the early bird sales ends soon for the Spring4D European Conference 2018 – Bergamo Italy, right before Easter 2019.

Both the original author and the current maintainer will be there, and it will be a great place to socialize with fellow Spring4D users.

Buy tickets: [WayBack] Spring4D Conference

Via:

–jeroen

Posted in Delphi, Development, Software Development, Spring4D | Leave a Comment »

 
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